Ako? Youre asking me? Hehe.
if ako, i think id list several reasons.
-clingy ako at needy, i always want to be with and talk to him. Cant help it, siya stress reliever ko
-madami daw ako demands at expectations na impossible, napepressure siya. Actually, minomotivate ko lang magwork siya at magsikap. Although sometimes harsh nga ako. Kasi di umeepek yung simple motivation lang
-mareklamo ako at maarte daw. Mga mababaw na rants lang naman
-hindi siya open at legal sa side ng family ko 
-selosa ako at posessive but not in a paranoid way naman, more of nagpapalambing levels lang
-cinocontrol ko yung vices niya, i want him to lessen his drinking and yosi and pagmumura. --Hence, nababawasan din time niya with friends. Icocompare niya kasi nung single siya, eh malamang kasi may gf na siya
-ayaw ko sa ibang friends niya, mga BI kasi at userfriendly, inaabuso lang siya
-ang kulit kulit kulit ko
there syempre in the long run, naiipon. Nakakasakal.
As I was reading your posts re: this partner of yours, it seems like you never really understood what your guy needed in the relationship. You may say you loved him completely, pero based sa complains nya about you, you are trying to make him into someone you want to love and be with. Posible kase na oo, gusto mo sya, pero may idea ka of this one person who you think is best to love, and dahil gusto mo sya, you tried to make him fit your idea of a partner. I know you know that's not healthy. Pwede mo sabihin gusto mo lang sya mag improve, pero you can never really impose change to anyone. Kahit na maganda ang intentions mo, to make him better, na magsikap sya, na wag sya magbisyo, lalo sya magreresist if pinipilit mo syang baguhin lahat yan. Lalo na kase nararamdaman na he's no good kung ipapaalala mo sa kanya everytime na indeed, he's no good. Kahit naman yata sino, mapupuno sa ganyang sistema.
Also, try to put yourself in your guy's shoes. If he tells you to stay away from your friends, just because they's influencing you negatively, how would you feel? Imagine being friends with them your whole life and then suddenly someone asked you to stay away from them. You know your friends better. In your case, hindi kaya nagiging judgmental ka lang sa mga kaibigan nya?
Also, as a supportive woman, you don't take away the life of your man so he can spend time with you. Natawa ako sa statement mo --
eh malamang kase may gf na sya. Now that is just mean and irrational. Bago kayo nagkakilala, may buhay sya without you. Don't expect him to leave all that just because you're together. Being in a relationship with you is going to be an expansion of his life, of his experiences. You're never going to be his whole world, you're just a part of it, a significant one at that.
Also, yung mga mababaw na rants lang naman for you, yun nga usually ang ayaw ng mga lalaki. Ang liit na bagay irereklamo mo pa. Anyway, ang dami kong nasulat haha kase na-sad ako how the relationship went. Obviously, you deserve better. Kase you want him to be better eh. You don't want him, you want someone better than him. Also, he deserves someone better too. You are obviously not the one for him. I say this kase when you found that one that fits your idea of a partner, everything else is easy and effortless. Lahat ng complains mo about him, and his about you, wala yan. Promise. Magkakasundo kayo sa mga bagay at hindi hindi mo sya gugustuhing magbago dahil you appreciate him as he is.
If there's one thing I appreciate about my current relationship, is that I don't demand for anything. Ironically though, my guy gives me everything. Maybe you can try that as well. Also, I say thank you everyday.